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   /*
    * Copyright 2012 The Netty Project
    *
    * The Netty Project licenses this file to you under the Apache License,
    * version 2.0 (the "License"); you may not use this file except in compliance
    * with the License. You may obtain a copy of the License at:
    *
    *   https://www.apache.org/licenses/LICENSE-2.0
    *
   * Unless required by applicable law or agreed to in writing, software
   * distributed under the License is distributed on an "AS IS" BASIS, WITHOUT
   * WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. See the
   * License for the specific language governing permissions and limitations
   * under the License.
   */
  package io.netty.handler.codec.http.multipart;
  
  import io.netty.buffer.ByteBuf;
  import io.netty.buffer.Unpooled;
  import io.netty.util.AbstractReferenceCounted;
  import io.netty.util.internal.ObjectUtil;
  
  import java.nio.charset.Charset;
  import java.util.ArrayList;
  import java.util.List;
  
  /**
   * This Attribute is only for Encoder use to insert special command between object if needed
   * (like Multipart Mixed mode)
   */
  final class InternalAttribute extends AbstractReferenceCounted implements InterfaceHttpData {
      private final List<ByteBuf> value = new ArrayList<ByteBuf>();
      private final Charset charset;
      private int size;
  
      InternalAttribute(Charset charset) {
          this.charset = charset;
      }
  
      @Override
      public HttpDataType getHttpDataType() {
          return HttpDataType.InternalAttribute;
      }
  
      public void addValue(String value) {
          ObjectUtil.checkNotNull(value, "value");
          ByteBuf buf = Unpooled.copiedBuffer(value, charset);
          this.value.add(buf);
          size += buf.readableBytes();
      }
  
      public void addValue(String value, int rank) {
          ObjectUtil.checkNotNull(value, "value");
          ByteBuf buf = Unpooled.copiedBuffer(value, charset);
          this.value.add(rank, buf);
          size += buf.readableBytes();
      }
  
      public void setValue(String value, int rank) {
          ObjectUtil.checkNotNull(value, "value");
          ByteBuf buf = Unpooled.copiedBuffer(value, charset);
          ByteBuf old = this.value.set(rank, buf);
          if (old != null) {
              size -= old.readableBytes();
              old.release();
          }
          size += buf.readableBytes();
      }
  
      @Override
      public int hashCode() {
          return getName().hashCode();
      }
  
      @Override
      public boolean equals(Object o) {
          if (!(o instanceof InternalAttribute)) {
              return false;
          }
          InternalAttribute attribute = (InternalAttribute) o;
          return getName().equalsIgnoreCase(attribute.getName());
      }
  
      @Override
      public int compareTo(InterfaceHttpData o) {
          if (!(o instanceof InternalAttribute)) {
              throw new ClassCastException("Cannot compare " + getHttpDataType() +
                      " with " + o.getHttpDataType());
          }
          return compareTo((InternalAttribute) o);
      }
  
      public int compareTo(InternalAttribute o) {
          return getName().compareToIgnoreCase(o.getName());
      }
  
      @Override
      public String toString() {
          StringBuilder result = new StringBuilder();
         for (ByteBuf elt : value) {
             result.append(elt.toString(charset));
         }
         return result.toString();
     }
 
     public int size() {
         return size;
     }
 
     public ByteBuf toByteBuf() {
         return Unpooled.compositeBuffer().addComponents(value).writerIndex(size()).readerIndex(0);
     }
 
     @Override
     public String getName() {
         return "InternalAttribute";
     }
 
     @Override
     protected void deallocate() {
         // Do nothing
     }
 
     @Override
     public InterfaceHttpData retain() {
         for (ByteBuf buf: value) {
             buf.retain();
         }
         return this;
     }
 
     @Override
     public InterfaceHttpData retain(int increment) {
         for (ByteBuf buf: value) {
             buf.retain(increment);
         }
         return this;
     }
 
     @Override
     public InterfaceHttpData touch() {
         for (ByteBuf buf: value) {
             buf.touch();
         }
         return this;
     }
 
     @Override
     public InterfaceHttpData touch(Object hint) {
         for (ByteBuf buf: value) {
             buf.touch(hint);
         }
         return this;
     }
 }